Within the ATP World Tour Rankings there are four categories of tournaments where players can get points for the rankings:
Grand Slams : Australian Open, Roland Garros, Wimbledon, US Open*
Masters : Cincinnati, Indian Wells, Madrid, Miami, Monte Carlo, Parijs, Rome, Shanghai, Montreal
ABN AMRO World Tennis Tournament, Acapulco, Barcelona, Basel, Beijing, Dubai, Hamburg, Tokio, Washington, Halle, Queen's Londen, Vienna en Rio de Janeiro
All other ATP World Tour tournaments, including for example the Ricoh Open
The stated number of points indicates how many points the winner of the tournament gets for his ATP World Tour Ranking.
* Grand Slams are not ATP events